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1、RadioFans.CN 收音机爱 好者资料库 - 1-1 - CONTENTS SECTION 1.GENERAL SERVICING PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2 ESD PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
2、 1-4 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .1-5 LOCATION OF CUSTOMER CONTROLS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6 SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE . . .
3、 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1 BLOCK DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5 SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4、. . . . . . . . . . . . . . . 2-7 WIRING DIAGRAM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-17 PRINTED CIRCUIT DIARGAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-19 SECTION 3.DVD PART E
5、LECTRICAL TROUBLESHOOTING GUIDE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1 DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING . . . . . . . . . . . . . . . . .3-9 BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6、. . . . . . . . .3-22 DVD PART SCHEMATIC DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-23 VOLTAGE SHEET (IC &TR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-31 PRINTED CIRCUIT DIAGRAM . . . . . . . . .
7、. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-33 SECTION 4. EXPLODED VIEWS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4-1 SECTION 5. SPEAKER PART . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5-1 SECTION 6. REPLACEMENT
8、 PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . .6-1 RadioFans.CN 收音机爱 好者资料库 - 1-2 - SECTION 1. GENERAL SERVICING PRECAUTIONS NOTES REGARDING HANDLING OF THE PICK-UP 1. Notes for transport and storage 1) The pick-up should always be left in its conductive bag until immediately prior
9、to use. 2) The pick-up should never be subjected to external pressure or impact. 2. Repair notes 1) The pick-up incorporates a strong magnet, and so should never be brought close to magnetic materials. 2) The pick-up should always be handled correctly and carefully, taking care to avoid external pre
10、ssure and impact. If it is subjected to strong pressure or impact, the result may be an operational malfunction and/or damage to the printed-circuit board. 3) Each and every pick-up is already individually adjusted to a high degree of precision, and for that reason the adjustment point and installat
11、ion screws should absolutely never be touched. 4) Laser beams may damage the eyes! Absolutely never permit laser beams to enter the eyes! Also NEVER switch ON the power to the laser output part (lens, etc.) of the pick-up if it is damaged. 5) Cleaning the lens surface If there is dust on the lens su
12、rface, the dust should be cleaned away by using an air bush (such as used for camera lens).The lens is held by a delicate spring. When cleaning the lens surface, therefore, a cotton swab should be used, taking care not to distort this. 6) Never attempt to disassemble the pick-up. Spring by excess pr
13、essure. If the lens is extremely dirty, apply isopropyl alcohol to the cotton swab. (Do not use any other liquid cleaners, because they will damage the lens.) Take care not to use too much of this alcohol on the swab, and do not allow the alcohol to get inside the pick-up. Storage in conductive bagD
14、rop impact NEVER look directly at the laser beam, and dont let contact fingers or other exposed skin. Magnet How to hold the pick-up Conductive Sheet Cotton swab Pressure Pressure RadioFans.CN 收音机爱 好者资料库 - 1-3 - NOTES REGARDING COMPACT DISC PLAYER REPAIRS 1. Preparations 1) Compact disc players inco
15、rporate a great many ICs as well as the pick-up (laser diode).These components are sensitive to, and easily affected by, static electricity. If such static electricity is high voltage, components can be damaged, and for that reason components should be handled with care. 2) The pick-up is composed o
16、f many optical components and other high-precision components. Care must be taken, therefore, to avoid repair or storage where the temperature of humidity is high, where strong magnet- ism is present, or where there is excessive dust. 2. Notes for repair 1) Before replacing a component part, first d
17、isconnect the power supply lead wire from the unit 2) All equipment, measuring instruments and tools must be grounded. 3) The workbench should be covered with a conductive sheet and grounded. When removing the laser pick-up from its conductive bag, do not place the pick-up on the bag. (This is becau
18、se there is the possibility of damage by static electricity.) 4) To prevent AC leakage, the metal part of the soldering iron should be grounded. 5) Workers should be grounded by an armband (1M ) 6) Care should be taken not to permit the laser pick-up to come in contact with clothing, in order to pre
19、vent sta- tic electricity changes in the clothing to escape from the armband. 7) The laser beam from the pick-up should NEVER be directly facing the eyes or bare skin. Resistor (1 Mohm) Conductive Sheet Resistor (1 Mohm) Armband BLOCK DIAGRAM 2-52-6 2-72-8 SCHEMATIC DIAGRAMS POWER (SMPS) SCHEMATIC D
20、IAGRAM 2-92-10 -COM SCHEMATIC DIAGRAM 2-112-12 FRONT & POWER(2nd) SCHEMATIC DIAGRAM 2-132-14 DAP SCHEMATIC DIAGRAM 2-152-16 AMP SCHEMATIC DIAGRAM 2-172-18 WIRING DIAGRAM 2-192-20 PRINTED CIRCUIT BOARD DIAGRAMS MAIN P.C. BOARD DIAGRAM (SOLDER SIDE) 2-212-22 MAIN P.C. BOARD DIAGRAM (COMPONENT SIDE) 2-
21、232-24 POWER(SMPS) P.C. BOARD (SOLDER SIDE) 2-252-26 FRONT P.C. BOARD DIAGRAM (SOLDER SIDE) 3-213-22 DVD PART SCHEMATIC DIAGRAMS MPEG SCHEMATIC DIAGRAM 3-233-24 SERVO SCHEMATIC DIAGRAM 3-253-26 AUDIO SCHEMATIC DIAGRAM 3-273-28 VOLTAGE SHEET (IC& TR) 3-293-30 PRINTED CIRCUIT DIAGRAM DVD P.C. BOARD(SO
22、LDER SIDE) 3-313-32 DVD P.C. BOARD (COMPONENT SIDE) 4-14-2 SECTION 4. EXPLODED VIEWS CABINET AND MAIN FRAME SECTION 351 320 305 454 455 455 454 A46 454 A26 280 275 277 455 A43 455 455 250 265 269 303 301 A47 A41 454 454 454 454 NOTE) Refer to “SECTION 6 REPLACEMENT PARTS LIST” in order to look for t
23、he part number of each part. 4-34-4 DECK MECHANISM EXPLODED VIEW 4-54-6 MEMOMEMO - 1-4 - ESD PRECAUTIONS Electrostatically Sensitive Devices (ESD) Some semiconductor (solid state) devices can be damaged easily by static electricity. Such components commonly are called Electrostatically Sensitive Dev
24、ices (ESD). Examples of typical ESD devices are integrated circuits and some field-effect transistors and semiconductor chip components.The following techniques should be used to help reduce the incidence of component damage caused by static electricity. 1. Immediately before handling any semiconduc
25、tor component or semiconductor-equipped assembly, drain off any electrostatic charge on your body by touching a known earth ground. Alternatively, obtain and wear a commercially available discharging wrist strap device, which should be removed for potential shock reasons prior to applying power to t
26、he unit under test. 2. After removing an electrical assembly equipped with ESD devices, place the assembly on a conductive sur- face such as aluminum foil, to prevent electrostatic charge buildup or exposure of the assembly. 3. Use only a grounded-tip soldering iron to solder or unsolder ESD devices
27、. 4. Use only an anti-static solder removal device. Some solder removal devices not classified as anti-static can generate electrical charges sufficient to damage ESD devices. 5. Do not use freon-propelled chemicals.These can generate electrical charges sufficient to damage ESD devices. 6. Do not re
28、move a replacement ESD device from its protective package until immediately before you are ready to install it. (Most replacement ESD devices are packaged with leads electrically shorted together by conductive foam, aluminum foil or comparable conductive materials). 7. Immediately before removing th
29、e protective material from the leads of a replacement ESD device, touch the protective material to the chassis or circuit assembly into which the device will by installed. CAUTION : BE SURE NO POWER IS APPLIED TO THE CHASSIS OR CIRCUIT, AND OBSERVE ALL OTHER SAFETY PRECAUTIONS. 8. Minimize bodily mo
30、tions when handing unpackaged replacement ESD devices. (Otherwise harmless motion such as the brushing together of your clothes fabric or the lifting of your foot from a carpeted floor can gen- erate static electricity sufficient to damage an ESD device). CAUTION. GRAPHIC SYMBOLS THE LIGHTNING FLASH
31、 WITH APROWHEAD SYMBOL. WITHIN AN EQUILATERAL TRIANGLE, IS INTENDED TO ALERT THE SERVICE PERSONNEL TO THE PRESENCE OF UNINSULATED “DANGER- OUS VOLTAGE” THAT MAY BE OF SUFFICIENT MAGNITUDE TO CONSTITUTE A RISK OF ELECTRIC SHOCK. THE EXCLAMATION POINT WITHIN AN EQUILATERAL TRIANGLE IS INTENDED TO ALER
32、T THE SERVICE PERSONNEL TO THE PRESENCE OF IMPORTANT SAFETY INFORMATION IN SERVICE LITERATURE. - 1-5 - SPECIFICATIONS - 1-6 - LOCATION OF CUSTOMER CONTROLS FRONT PANEL DISPLAY WINDOW - 1-7 - REAR PANEL - 1-8 - Remote Control - 2-1 - SECTION 2. AUDIO PART AUDIO TROUBLESHOOTING GUIDE 1. POWER SUPPUY C
33、IRCUIT - 2-2 - 2. FRONT CIRCUIT (1/2) - 2-3 - 3. FRONT CIRCUIT (2/2) - 2-4 - MEMO - 3-1 - SECTION 3. DVD PART DVD TROUBLESHOOTING GUIDE 1. Power check flow - 3-2 - 2.Test & debug flow - 3-3 - - 3-4 - - 3-5 - - 3-6 - - 3-7 - - 3-8 - DETAILS AND WAVEFORMS ON SYSTEM TEST AND DEBUGGING 1. SYSTEM 27MHz C
34、LOCK,RESET,FLASH R/W SIGNAL 1) MT1379 main clock is at 27MHz(X501) 2) MT1336 reset is high active - 3-9 - 3) RS232 waveform during procedure(Downloading) 4) Flash R/W enable signal during download(Downloading) - 3-10 - 2. SDRAM CLOCK 1) MT1379 main clock is at 27MHz(X501) 3.TRAY OPEN/CLOSE SIGNAL 1)
35、 Tray open/close waveform - 3-11 - 2) Tray close waveform 3) Tray open waveform - 3-12 - 4. SLED CONTROL RELATED SIGNAL (NO DISC CONDITION) 5. LENS CONTROL RELATED SIGNAL(NO DISC CONDITION) - 3-13 - 6. LASER POWER CONTROL RELATED SIGNAL (NO DISC CONDITION) 7. DISC TYPE JUDGEMENT WAVEFORM - 3-14 - -
36、3-15 - 8. FOCUS ON WAVEFORM - 3-16 - 9. SPINDLE CONTROL WAVEFORM (NO DISC CONDITION) - 3-17 - 10.TRACKING CONTROL RELATED SIGNAL(System checking) - 3-18 - 11. RF WAVEFORM 12. MT1379 AUDIO OPTICAL AND COAXIAL OUTPUT (ASPDIF) - 3-19 - 13. MT1379 VIDEO OUTPUT WAVEFORM 1) Full colorbar signal(CVBS) 2) Y - 3-20 - 3) C 14. AUDIO OUTPUT FORM AUDIO DAC 1) Audio related Signal - 5-1 - SECTION 5. SPEAKER SECTION MODEL : LHS-D6245W 858 856 857 855 859 859 861 852 854 852 851 - 5-2 - MODEL : LHS-D6245T 861 854 853 861 852 860 862 862 851 850
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